Limiting Factors of Photosynthesis - GCSE Biology AQA
- Created by: makeuppcharlotte
- Created on: 07-01-19 11:45
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- Limiting Factors
- Winter
- In winter, temperature is usually the limiting factor.
- Warm & Bright
- In warm & bright conditions, carbon dioxide concentration is usually the limiting factor.
- Night
- At night, light intensity is usually the limiting factor.
- Mineral - Deficient Soil
- If plants are grown in mineral - deficient soil / lacking minerals soil, they may not absorb enough minerals to produce lots of chlorophyll.
- In this case, chlorophyll concentration can be the limiting factor.
- Photosynthesis in Farming
- An understanding of limiting factors is important for plant production in greenhouses. Farmers must evaluate the trade-off (balance) between the costs of lighting and heating, and the rate of photosynthesis that is possible.
- Increasing Yield
- A high rate of photosynthesis means that crops grow faster and the total yield is bigger.
- Lighting and heating in greenhouses increase the rate of photosynthesis that is possible.
- Cost
- Farmers must evaluate the trade-off between the costs of lighting and heating, and the rate of photosynthesis that is possible.
- However, if lighting and heating are very expensive, it may not be possible to spend money on increasing the light intensity and temperature of a greenhouse.
- Uses of Glucose
- The glucose produced by photosynthesis is mainly used for respiration in plants. However, it can also be converted into other products such as starch.
- Starch
- Starch is insoluble (cannot be dissolved) and is stored in stems, leaves or roots.
- Cellulose
- Cellulose is used to strengthen cell walls. It is particularly important for fast-growing plants.
- Proteins
- A source of nitrogen is also needed for glucose to be converted to protein.
- Proteins are needed for cell growth and repair.
- Plants get this nitrogen by absorbing nitrate ions (minerals) from soil.
- Fats & Oils
- Fats & oils are stored in structures such as seeds.
- For example, sunflower seeds are a key ingredient in cooking oils.
- Winter
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